correctness of using longjump

[Antero Vipunen <antero@...>]

Hi!

  Is the using of longjump always correct?
  For example consider the following samples:

  int testi(int i) {
    return !i;
  }

  int error(lua_State *L) {
      lua_pushstring(L, "some error");
      lua_error(L);
  }

  int some_func1(lua_State *L) {
      int i;
      int j = error(L);
      int k;
      // some other code here
  }

  int some_func2(lua_State *L) {
      int i;
      int j;
      int k;

      j = error(L);
      // some other code here
  }

  int some_func2(lua_State *L) {
      int i;
      int j;
      int k;

      testi(error(L));
      // some other code here
  }

  int some_func2(lua_State *L) {
      int i;
      int j;
      int k;

      return testi(error(L));
  }

  Is it correct? Can this code somehow corrupt the stack?
  
--
 Antero Vipunen